Furnace.



PATENTED MAR. 19,- 1907.

H. B. MEEOH.

PURNAGE APPLIOMIONv FILED MAY 1o. 1906.

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` PATENTED MAR. 19, 1907.' H. B. MBECH.

FURNACB.

APPLICATION FILED MAY10. 190e.

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. A -f By AOB/vn Aing conducted through HARRISON B. MEEOH, OF NEW YORK, N. Y.

Specification of Letters Patent.

FURNACE.

Patented March 19, 1907.

Application filed May 10.1906. Serial N0 316,201.

To @ZZ whom t may concern:

Be it known that I, HARRISON B. Manon, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a new and useful Furnace, of which the following is a specification.

This invention relates to furnaces for the production of bauxite and similar ores ,where intense heat is required and for which electrical furnaces are usually necessary.

The principal object of the invention is to provide a furnace in which intense heat may )e attained from the use of soft coal, the coal being first coked and the gases generated bea reverberatory furnace and burned on top of the hearth, while the coke which results is forced at intervals onto a suitable grate and there burned in the ordinary manner, its combustible gases combining with those arising from fresh charges of coal in the coking-retorts and the heat from both sources being utilized after passing over the'hearth for the purpose of coking the coal.

A further object of the invention is to provide a furnace which may be constructed at comparatively small expense and in which the heat is fully utilized both for coking purposes and in heating the air by which combustion is supported.

With these and other objects in view, as will more fully hereinafter appear, the inven tion consists in certain `novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

.ln the accompanying drawings, Figure 1 is a longitudinal sectional elevation of a reverberatory furnace constructed in accordance with the invention. Fig. 2 is a transverse sectional view of the same on the line 2 2 of Fig. 1. Fig. 3 is a similar view on the line 3 3 of Fig. 1. Fig. 4 is a sectional view on the line 4 4 of Fig. 1. Fig. 5.1`s a plan view of the ore-drying trough in which the ore is heated and dried before being introduced into the furnace. Fig. 6 is a transverse sectional view of a portion of the underground fiuefat the point where the ore-drying trough 1s located. Fig. 7 is a horizontalsection of the escape flue or stack.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The furnace is built up of fire-brick of any suitable character and includes a combustion-chamber 10, at the lower portion of which is a suitable grate 11, and at the opposite sides of the combustion-chamber are arranged feed-doors 12, through which combustible material may be introduced when fires are started, the doors being afterward closed and luted and remaining air-tight during the operation of the furnace. Below the grate is an ash-pit 15, having suitable doors 16, through which the unconsumed cinders may be withdrawn.

The furnace-bed 17 is separated from the combustion-chamber by a bridge-wall 18, and at opposite sides and one end of the furnace-bed are suitable door-spaces 19, which may be closed by doors 20, the latter being preferably hung on counterweighted chains or wire cables 21, these doors being closed and luted during the operation of the furnace. At one side is arranged a suitable tap 23, through which the material may be withdrawn.

At the top of the furnace are feed-openings 24, which are closed by slidable doors 25, formed of fire-brick or other suitable material, these being rnace. The ore is fed in when necessary by a pair of tapered hoppers 26, supported by a suitable frame 27, the hoppers gradually narrowing to small discharge-necks 28, that are arranged immediately above the openings 24, and these necks being surrounded by telescoping tubes 29, which are moved down into alinement with the openings when the covers 25 are removed. V

In front of the combustion-chamber are arranged a number of retorts 30, three of which are shown in the present instance, and these retorts are tapering in width, with their narrowest ends outermost and closed by doors 31. These retorts are supplied with soft coal, which is distilled by heat from the products of combustion after leaving the furnace-bed, and the gases arising from the distilling process mingle with the products of combustion arising from the fuel on the grate and pass over the bridge-wall and into conluted during the operation of the IOO while i'resh charges of tact 'with the ore 'oi the furnace-bed V17. Al'ter the coliing operation is completed the coke which remains is 'forced through the tapered retorts and thence upon the grate, coal are introduced into the retorts 'for another distilling operation.

The space below the Jfurnace-bed is divided by two longitudinally-extending parallel walls 34 into three vertical spaces, and these are again subdivided by horizontally-disposed artitions, `forming a number of Vllues through which the products of combustion and air may pass.

rlhe uppermost ilues 35 at the opposite sides of the Yfurnace communicate at one end with downtalres 36, leading 'from the furnacebed, and through which the products of conibustion pass after contact with the ore. The heated gases pass through the downtalies and thence through the horizontal llues 35 toward the front ot the furnace and at the iront are directed into a central. l'lue 37, as shown in Fig. 2, from whence they pass entirely around the coling-retorts 30, and finally escape to the underground 'flue or stack 39, the heat imparted to the retort being su'l'licient to carry on the process of distillation.

The lowermost ilues 40 and 41 serve for the admission oi' air, the air from l'lue 41 passing upward into a flue 42 and thence upward into a horizontal liuc 43, through which it travels beyond the iront of the Vfurnace, the air being heated by radiation from the products of combustion passing through the side tlues 35. A portion ot this air passes upward through a vertical ['lue 44 in the bridge-wall and thence is directed through the horizontal passages 45 into the combustion-chamber at a point some distance above the level o'l the grate. The remaining air passes through the lue 46 and upward through a vertical liuc 47 and is discharged through short horizontal passages 48,1eading through the front wall ol the combustionchamber. The air which enters the i'lue 40 at one side of the 'furnace passes rearward and thence across andback through the other side Vliuc 40 and is discharged from the latter at a point below the grate.

The upper central space 50 immediately below the bed of the furnace communicates with the i'lue 43 through a seriesoij openings, the air heated within tl-iefspaceA 50 passing outward through a pipe ltobe` otherwise utilized in the plant.` i

At 'a suitable point betweenv the underground Hue and the main stack 52 is placed. a conveyer or trough 53, in which the ore is placed and dried to an extent suiiicient to expel all moisture before being placed in the furnace.

In operation a fire is made on the grate with Wood, coke, or other suitable combustiw ble material, and a slow 'lire is continued for "flue intothe ash-pit.

several days to dry and season the furnace. rl`he retorts are then Vlilled with soit coal, and the distillation commences, the gases passing oil' and burning with the air over the eolie 'lire on the grate. The lire is increased to calcine the furnace-bed, aifter which the 'liux is supplied to the hirnare-lmd and the heat is continued until the lluX becomes molten. rl`hc line ore is then admitted lroin the hoppers and continued until sullicient is melted to tap out into drinn liettles and then manipulated as required to separate the metals from the slag.

l claim# l. ln an ore-smelting liurnaee, the combination with a reverberatory furnace-bed, oll a combustion-chamber, a bridge-wall separating the iiurnzuze-bed from the conilalstionchamber, a retort having its dirwharge end opening through the :liront wall ot the co1nbustion-chamber, and. air-heating llues arranged below the furnace-luid, there being air-discharge openings in the iront wall ol the combustion-chamber at a point below the retort, said openings being .in connnunication with the air-heating llues.

2. ln a furnace, a reverl)oratory lurnacebed, .a combustion-chamber, a bridge-wall selarating the lurmice-bed lroin the co1nbustion-chainber, a retort tapering in width and having its widest end opening through the iront wall ot the conil ustion-ehaniber, air-heating ilues arranged below the l'urnacebed, air-ducts leading liroin the llues and opening through the l'ront and rear walls oll the combustion-chamber, the openings in the iront wall being innnediately below thi` inner end of the retort, and escape-llues arranged adjacent to the air-heating Vllues and through which the producls oli combustion pass from the hunace-bed to and around the retort.

3. ln a lurnace, a revcrberatory furnace! bed, a combustion-chamber, a bridge-wall spacing the furnace-bed. kfrom the coinlulstionechamber, a retort tapering in width and having its widest end opening through the lront wall of the combustion-chamber, a plurality ot vertical and horizontallydisposed partitions arranged below the .l`iu1iac.e.-l)ed and dividing the space into e .ape-llues lor thc products o'l' combustion Vfrom the lfurnacebed, and air-heating ilues, a. vllue in coinnn1- nication with the escape-[lue andv surrouiiding the retort, and ducts leading from the air-heating vllues and opening through the lront and. rear walls ot the cornl )ustion-chainber.

ln testimony that .l claim the-foregoing as my own ll have hereto allixed my signature in the presence ol two witnesses.

HARRISON B. MllCCl'l.

liVitnesscs 1 JNO. E. PARKER,

J. Ross (lorirrorv.`

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